JIS B 1759に基づいたPA66歯車の負荷容量評価

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  • Load Capacity Evaluations of PA66 Gears Based on JIS B 1759

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The present paper describes load capacity evaluations of PA66 gears which were performed against gear running test results on the basis of JIS B 1759. Unreinforced PA66 was evaluated to have a permissible bending strength of 44.9 MPa. This value could be valid, so that JIS B 1759 would be suitable for evaluations of PA66 gears. However, PA66 has a large friction coefficient on PA66, and PA66 gear pairs showed severe wear. As a result, their failure modes did not a tooth breakage, so that a mating gear factor of PA66 on PA66 cannot be determined. Meanwhile, failure modes of glass-fiber-reinforced PA66 gear pairs were tooth breakage, so that their running test results were evaluated on the basis of JIS B 1759. However, their permissible bending strength was evaluated to be much smaller than the bending strength published by material manufactures. This is because fiber orientations in test gears could not be effective in enhancing their load capacity although those in test pieces for bending tests must be appropriate for the tests. In addition, accuracy of plastic gears could slightly affect their load capacity, so that restrictions on test gear accuracy may be eased. Furthermore, a regulation on a variation in an applied torque to a test gear should be revised, because it would be impossible to follow it exactly.

収録刊行物

  • 精密工学会誌

    精密工学会誌 83 (2), 180-185, 2017

    公益社団法人 精密工学会

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